Monitoring of low plutinium activities in air

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Abstract

The possible methods of monitoring low plutonium activities of the order of 0.1-0.001 MPC (10-0.1 mBq/m3) in the inner and outer atmosphere are analysed and compared. Integral and spectrometric, continuous and discontinuous mode operating monitoring systems are described. Monitors based on gross alpha counting are not sensitive enough to detect reliably plutonium activities below 1 MPC. Surface barrier detectors allow to detect at one hour sampling (and counting) time plutonium activities of the order of 0.1 MPC. A spectrometric, discontinuously operating monitor, using a large area gridded ionisation chamber and a 10 cm diameter membrane filter is described, which allows to detect, at one hour sampling and one hour counting time, plutonium activities below 0.01 MPC.

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